I'd like to suggest a change to the process of graveyarding. I suggest that donations and the Helios Tower are no longer graveyarded with the account. They become part of the world, not the account. After all, while I teleport a city in a world, I don't get to teleport my donations or my Helios Tower. Someone who comes back to a different world starts with no Donation Score and no Helios Towers. Someone who comes back to the same world cannot re-donate their Donation Score and their Helios Towers remain in situ. I'd also like to see Generals Score and Gold set to zero after coming back from the graveyard, whether or not you return to same world.
This would stop the abuse of graveyarding.